ANALYSIS OF THE QUALITY OF PERMEATES OBTAINED BY ULTRAFILTRATION OF WATER-BASED STAIN THROUGH YM5 AND YM100 MEMBRANES

The possibility of using ultrafiltration in the treatment of waste wat er from wood staining operations was investigated. The study was confi ned to water-based stains, because their use in wood finishing is on t he increase. In the ultrafiltration process Recombined Cellulose Ultra filtration membranes type YM100 and YM5 were used. The changes of each membrane was evaluated using scanning electron microscopy. To ascerta in how the flow rate was changing as a function of time of filtration the quantity of permeates was measured every hour. By studying the per meate (BOD, COD, GC/MS), information about permeability of the membran es and about purity of the filtrate and its environmental acceptabilit y were obtained. (C) 1997 Elsevier Science Ltd.